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Fengge Zhang,Hao Liu 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1
The different winding connection modes of dual-stator brushless doubly-fed machine (DSBDFM) are investigated to ensure the electromagnetic characteristics consistency of outer and inner stator. The electromagnetic characteristics consistency is not only required that the electromotive force (EMF) amplitude and phase match the requirements of outer and inner stator winding connection mode, but also the number of parallel branches of winding should be considered to avoid the circular current and phase difference. This paper proposes a method for the number of parallel branches of winding, which is helpful to determine the number of parallel branches of two sets of winding with different pole pairs number in stator slots and ensure the EMF amplitude and phase of per branch winding. The field-circuit method (FCM) is used to analyze the different connection modes of DSBDFM, such as series, parallel, series and parallel. The finite element method was confirmed agreement with the FCM, indicating the validity and rationality of FCM.
High Efficiency Operation of a Switched Reluctance Generator over a Wide Speed Range
Yu, Siyang,Zhang, Fengge,Lee, Dong-Hee,Ahn, Jin-Woo The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1
This paper investigates the high efficiency operation of a switched reluctance generator over a wide speed range. The system efficiency is improved by optimizing the current shape. A modified angle position control (MAPC) method that can be used to optimize the current shape over a wide speed range is proposed. Simulation and experimental results are presented to validate the effectiveness of the proposed control scheme.
Xu, Zhenyao,Zhang, Fengge,Lee, Dong-Hee,Ahn, Jin-Woo The Korean Institute of Electrical Engineers 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
In this paper, a novel 12/14 hybrid pole type bearingless switched reluctance motor (BLSRM) with short flux path and no flux-reversal in the stator is proposed. The proposed BLSRM has separated rotating torque and suspending force poles. Because of independent characteristics between torque and suspending force poles, the torque control can be decoupled from the suspending force control. Due to the short flux path without any reversal flux, compared to the 8/10 hybrid stator pole BLSRM, the output torque is significantly improved and the air-gap is easier to control. Meanwhile, basic design principle for the proposed structure is described. To verify the proposed structure, finite element method (FEM) is employed to get characteristics of the proposed structure and 8/10 hybrid stator pole BLSRM. Based on the analysis, a prototype of the proposed BLSRM is designed and manufactured. Finally, validity of the proposed structure is verified by the experimental results.
Zhenyao Xu,Fengge Zhang,Dong-Hee Lee,Jin-Woo Ahn 대한전기학회 2012 Journal of Electrical Engineering & Technology Vol.7 No.5
In this paper, a novel 12/14 hybrid pole type bearingless switched reluctance motor (BLSRM) with short flux path and no flux-reversal in the stator is proposed. The proposed BLSRM has separated rotating torque and suspending force poles. Because of independent characteristics between torque and suspending force poles, the torque control can be decoupled from the suspending force control. Due to the short flux path without any reversal flux, compared to the 8/10 hybrid stator pole BLSRM, the output torque is significantly improved and the air-gap is easier to control. Meanwhile, basic design principle for the proposed structure is described. To verify the proposed structure, finite element method (FEM) is employed to get characteristics of the proposed structure and 8/10 hybrid stator pole BLSRM. Based on the analysis, a prototype of the proposed BLSRM is designed and manufactured. Finally, validity of the proposed structure is verified by the experimental results.
Xiaoju Yin,Fengge Zhang,Xiuping Wang,Yonggang Jiao,Zhenghe Ju 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.10
The combination of ampere-hour method and open-circuit voltage method in the photovoltaic measurement system is studied in this paper. In order to achieve the purpose of online measurement for remaining capacity, the influence of internal battery discharge and temperature on the battery capacity should be considered. The battery capacity decreases by the increasing charging times, and the increasing terminal voltage difference causes the inaccurate measurement of the capacity of battery. In this paper, two experimental measurement methods are employed, which are complementary to each other, to make the system measurement more accurate and extend the life of lead-acid batteries. If the charging process of photovoltaic system is unstable, an optimization of lead-acid battery applications in photovoltaic energy storage system is explored at the same time. Finally, an illustrative example is presented to demonstrate the effectiveness of the proposed measuring method.
The Least Action Solving Method of MPPT for Micro-Inverter in Distributed PV Grid
Xiaoju Yin,Fengge Zhang,Yonggang Jiao,Zhenhe Ju 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.4
The solar radiation conditions and environmental factors on the shadow of the power generation resulted in loss of efficiency. In this paper, a simple structure with interleaved isolation converter according to the characteristics of the hardware circuit is proposed in order to improve the conversion efficiency of photovoltaic grid system. First, the hot spot effect and discretization of solar panels according to the characteristics of the micro-inverter with a lot of promotion is analyzed. The least action recursive method is involved, which has high computing precision, and therefore is more suitable for distributed micro-inverter system. The PC56F8245 chip is chosen to overcome the loss of photovoltaic energy and improve the conversion efficiency. The stability and high accuracy has been proved through the related experiments.
High Efficiency Operation of a Switched Reluctance Generator over a Wide Speed Range
Siyang Yu,Fengge Zhang,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.1
This paper investigates the high efficiency operation of a switched reluctance generator over a wide speed range. The system efficiency is improved by optimizing the current shape. A modified angle position control (MAPC) method that can be used to optimize the current shape over a wide speed range is proposed. Simulation and experimental results are presented to validate the effectiveness of the proposed control scheme.